loongson/pypi: links for dbtx-cockroachdb

loongson/mirror dbtx-cockroachdb-1.7.8.tar.gz
loongson/mirror dbtx-cockroachdb-1.7.7.tar.gz
loongson/mirror dbtx-cockroachdb-1.7.6.tar.gz
loongson/mirror dbtx-cockroachdb-1.7.5.tar.gz
loongson/mirror dbtx-cockroachdb-1.7.4.post1.tar.gz